Absorption heat pumps use an ammonia-drinking water absorption cycle, as an alternative to a vapor-compression cycle, to transfer heat. Ammonia may be the refrigerant, and water is the absorber. The ammonia condenses at on the list of procedure’s coils to launch heat and evaporates at another coil to absorb heat. https://purethermal.co.uk/media-news/can-gas-absorption-heat-pumps-provide-an-alternative-heat-pump-option-in-2025/